CVS commit: src/usr.sbin/service

["Robert Elz" <kre%netbsd.org@localhost>]

Module Name:    src
Committed By:   kre
Date:           Tue Mar 14 06:19:35 UTC 2023

Modified Files:
        src/usr.sbin/service: service service.8

Log Message:
Don't inappropriately use xargs to run rcorder -- xargs is designed
to run the given command as many times as necessary, but rcorder must
be run just once, with all the rc.d scripts as args.   If that turns out
to be too many (E2BIG on exec) then we have more serious problems, working
around it by use of xargs just makes a mess (for rcorder).

Make the -e option cause the script to exit 0 if some enabled script was
found, and 1 if not, so one can do:
        if service -e foobar >/dev/null
        then
                whatever we want to do when foobar is enabled
        else
                anything we want instead if it is not
        fi
Someday perhaps add a -q to suppress the output instead of requiring
the redirect, but that day is not this one.  Make all error exit status
codes be >1 (and use the standard 126 instead of 255, for "exec failed").

Note that with more than one service given with -e, or when none are (so
all enabled scripts are listed) the exit status is 0 if any enabled script
was found (ie: anything was printed to stdout), not if all named scripts
exist and are enabled.   Testing the status works best with just one
script name given as an arg.

Correctly quote script names (and use eval where required) so scripts
(or paths to scripts) containing spaces, tabs, or shell operator chars
might be handled correctly (newlines in names will still cause failures.)

Treat rc.d scripts that do not have an rcvar (hence are always enabled)
as enabled scripts, rather than disabled - but ignore the LOGIN DAEMON...
pseudo-scripts.

While here, replace archaic uses of "test" ('[') (that is, -a etc) with
standard defined usages only, replace a baroque use of sed with sh code
(which is simpler and much faster, not that speed matters) - but do use sed
instead of two grep invocations.   Replace all uses of "echo" with "printf"
(just "because"!)   Make the usage more useful (explain what the various
option combinations achieve, explicitly), and also while here, make the
formatting look closer to something I can deal with (personally I prefer
tab indents almost everywhere, but 4 space is OK...)  Aligned runs of 8
spaces were all replaced by a tab.   For the options, use sh boolean cmds
(true|false), and simply run them, rather than making them be empty or set
and using test -n, it is easier to follow (and a tiny fraction of a ns faster).
Change a comment so what it says is relevant to the code that is present,
rather than to the change (referring to code that used to be present) with
which it was added.

Catch the manual page up with the minor parts of this intended to be
visible to users (like the exit status change).


To generate a diff of this commit:
cvs rdiff -u -r1.8 -r1.9 src/usr.sbin/service/service
cvs rdiff -u -r1.4 -r1.5 src/usr.sbin/service/service.8

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.